1. MANDEC, School of Dentistry, The University of Manchester; Cochrane Oral Health Group; Higher Cambridge Street Manchester UK M15 6FH
2. University of Leeds; Clinical Trials Research Unit; Clinical Trials Research House 71-75 Clarendon Road Leeds UK LS2 9NP
3. The University of Manchester; School of Dentistry; MANDEC, 3rd Floor, Dental Hospital Higher Cambridge Street Manchester UK M15 6FH